I'm using TMO 2.2, currently in an S-Boat. I find the best fuel mileage at ahead 2/3. 3000/4000 miles greater distance than ahead standard, maybe more. When I'm charging batteries I use ahead standard and immediately switch to 2/3 when the charge is completed. I find if I charge the batteries in an S-Boat at ahead 2/3 it really sucks up the fuel. I'll bet it cuts mileage in half.
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